THE MODEL CONTEXT PROTOCOL (MCP) AND TOOL STANDARDS

CHAPTER SUMMARY The MCP is an open standard that connects models and agents to tools and data, turning a many-by-many integration problem into a many-plus-many one. Hosts contain clients, clients connect to servers, and messages travel over transports such as stdio for local use and Streamable HTTP for networked use. Servers can offer tools, resources, and prompts. Standardization brings reuse, interoperability, an ecosystem, separation of concerns, and consistent safety controls. Limitations include context cost, uneven server quality, security exposure covered in Part Nine, operational complexity, and fast change. KEY TERMS REVIEW Protocol: an agreed set of rules for programs to talk. MCP: an open standard for connecting models to tools and data. Host, client, server: the application, its connection piece, and the program offering capabilities. Transport: the delivery method for messages. Standard input and output (stdio): a local transport through a program's input and output. Streamable HTTP: a network transport for remote servers. SDK: ready-made code libraries for building. Resource and prompt: data to read and reusable templates offered by a server. Interoperability: different systems working together without custom glue.